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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFFloor.java

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Java | 51 lines | 24 code | 6 blank | 21 comment | 3 complexity | 5b43b1297538a9349bb2060eede1078d MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
  1. /**
  2. * Licensed to the Apache Software Foundation (ASF) under one
  3. * or more contributor license agreements. See the NOTICE file
  4. * distributed with this work for additional information
  5. * regarding copyright ownership. The ASF licenses this file
  6. * to you under the Apache License, Version 2.0 (the
  7. * "License"); you may not use this file except in compliance
  8. * with the License. You may obtain a copy of the License at
  9. *
  10. * http://www.apache.org/licenses/LICENSE-2.0
  11. *
  12. * Unless required by applicable law or agreed to in writing, software
  13. * distributed under the License is distributed on an "AS IS" BASIS,
  14. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15. * See the License for the specific language governing permissions and
  16. * limitations under the License.
  17. */
  18. package org.apache.hadoop.hive.ql.udf;
  19. import org.apache.hadoop.hive.ql.exec.Description;
  20. import org.apache.hadoop.hive.ql.exec.UDF;
  21. import org.apache.hadoop.hive.serde2.io.DoubleWritable;
  22. import org.apache.hadoop.io.LongWritable;
  23. /**
  24. * UDFFloor.
  25. *
  26. */
  27. @Description(name = "floor",
  28. value = "_FUNC_(x) - Find the largest integer not greater than x",
  29. extended = "Example:\n"
  30. + " > SELECT _FUNC_(-0.1) FROM src LIMIT 1;\n"
  31. + " -1\n"
  32. + " > SELECT _FUNC_(5) FROM src LIMIT 1;\n" + " 5")
  33. public class UDFFloor extends UDF {
  34. private LongWritable result = new LongWritable();
  35. public UDFFloor() {
  36. }
  37. public LongWritable evaluate(DoubleWritable i) {
  38. if (i == null) {
  39. return null;
  40. } else {
  41. result.set((long) Math.floor(i.get()));
  42. return result;
  43. }
  44. }
  45. }